Graphite
Graphite (Carbon, C)
Mineral
Category
Mineral With Metamorphic Or Igneous Host
Browse mineral with metamorphic or igneous host specimens identified by the Rock Identifier community.
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Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Pyrite-bearing rock, possibly pyrite-rich schist or quartzite
Pyrite (iron disulfide, FeS₂) in a fine-grained metamorphic or quartz-rich matrix
mineral
River Rock with Quartz Vein
Basalt or Andesite with Quartz Veining
igneous
Granitic Pegmatite
Granitic Pegmatite with Quartz and Feldspar
igneous
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Quartz with Chlorite inclusions
Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)
mineral
Pegmatite (Quartz with Tourmaline/Biotite inclusions)
Igneous Pegmatite
igneous
Mica-rich schist (probable)
Mica schist, composed mainly of mica minerals with quartz and possibly feldspar
metamorphic
Pyrite in Matrix (Healers Gold / Pyrite Egg)
Iron Disulfide (FeS2) with Magnetite/Hematite matrix
mineral
Pyrite in Matrix
Iron Sulfide (FeS2) embedded in host rock
mineral
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Rough garnet (likely almandine)
Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)
mineral
Quartz-rich pegmatite fragment
Granite-family pegmatite; chiefly quartz (SiO₂), feldspar, and black mica (biotite)
igneous
Weathered rock with a tan mineral vein or inclusion
Indeterminate from the photograph; possibly a quartz- or feldspar-rich vein in dark metamorphic host rock
metamorphic
Agate (or Operculum / Fossil Shell)
Silicon Dioxide (SiO2)
mineral
Pyrite-bearing rock (likely pyrite-rich sulfide ore)
Pyrite, FeS₂, with possible dark host rock; exact matrix is not identifiable from the photo
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Red cut gemstone, likely synthetic ruby
Corundum (Al₂O₃); possibly lab-grown ruby or red glass imitation
gemstone
Tumbled Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Greenstone
Greenschist / Greenstone (Epimetamorphic Rock)
metamorphic
Chrysotile Asbestos
Mg3Si2O5(OH)4
mineral
K2 Jasper (K2 Granite)
Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)
igneous
Beryl (likely Pink/Morganite variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Blue faceted gemstone, likely synthetic sapphire or blue glass
Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually
gemstone
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Garnet (Almandine or Spessartine likely)
Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)
Mineral
Quartz-bearing pegmatite
Quartz (SiO₂) with feldspar and mica, likely a granitic pegmatite
igneous
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Pyrite in Host Rock
Iron Disulfide (FeS2)
mineral
Gold-bearing quartz (quartz with visible native gold)
Quartz (SiO₂) with native gold (Au)
mineral
Tumbled green aventurine (probable), with blue-gray tumbled stones
Aventurine quartz, SiO₂ with fuchsite or other mica inclusions; blue stones may be sodalite or dyed quartz
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral